AnswersCHS Chemistry AEvidence of Chemical Reactions

Percent Composition and Molecular Formula Answers

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7

Calculate the formula for the following hydrate composed of 76.9% CaSO3 and 23.1% H2O.

A
CaSO3 • H2O
B
CaSO3 • 2H2O
C
CaSO3 • 3H2O
D
CaSO3 • 4H2O
8

Carbon dioxide (CO2) is a gaseous compound. Calculate the percent composition of this compound. Answer using one decimal place.

Answers:
What is the percent by mass of carbon?:27.3
What is the percent by mass of oxygen?:72.7
10

Calculate the formula for the following hydrate composed of 76.9% CaSO3 and 23.1% H2O.

A
CaSO3 • H2O
B
CaSO3 • 2H2O
C
CaSO3 • 3H2O
D
CaSO3 • 4H2O

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